Hydrangea plant named ‘RIE 02’

ABSTRACT

A new cultivar of  Hydrangea  plant named ‘RIE 02’ that is characterized by broad upright habit, large dark-green leaves, flowers that are yellow-green and pink in color, and unique inflorescence development. In combination these traits set ‘RIE 02’ apart from all other existing varieties of  Hydrangea  known to the inventor.

Genus: Hydrangea.

Species: macrophylla.

Denomination: RIE 02.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of hydrangea that is grown for use as an indoor floral potted plant and an outdoor ornamental flowering shrub. The new cultivar is known botanically as Hydrangea macrophylla and will be referred to hereinafter by the cultivar name ‘RIE 02’.

‘RIE 02’ resulted from a breeding program that was conducted by the inventor at the inventor's nursery in Kyoto, Japan and began in 1990. The purpose of the breeding program was to produce new varieties of floral potted hydrangeas that exhibit new and unique flowers and flower color.

Between May 1990 and May 1993 the inventor assembled a collection of unnamed and unreleased hybrids from a sequence of deliberate pollinations involving the following cultivars, all unpatented, and available in commerce in Japan: Hydrangea macrophylla ‘Otafuku’, Hydrangea macrophylla ‘Yamaajisai’, and Hydrangea macrophylla ‘Fijinishiritaki’. The inventor did not record which variety was used as male parent and which as female parent. In May 1993, the inventor carried out a deliberate pollination between one unnamed plant from the inventor's collection as female parent and the variety Hydrangea macrophylla ‘Sumidanohanabi’ (unpatented) as male parent. The pollination described above produced thirty-five varieties, which the inventor considered novel and unusual. One of these individual varieties was selected by the inventor in June 1994 and is the subject of the present invention, ‘RIE 02’.

‘RIE 02’ is a deciduous shrub that exhibits large dark-green leaves and yellow-green and pink flowers that bloom in spring and summer. Selection was based on the distinguishing characteristics of flowers, flower color, and inflorescence development. ‘Lace cap’ type hydrangeas produce showy sterile flowers along the outside of the inflorescence, and small inner flowers that are fertile flowers. When an individual inflorescence of ‘RIE 02’ first opens, it looks like a ‘lace cap’ type inflorescence with large sterile flowers on the edge. However, unlike the ‘lace cap’ type Hydrangea, the inflorescence eventually fills out completely. Within the inflorescence, center fertile flowers are intermixed with center sterile flowers, so that as the inflorescence develops further, the sterile flowers in the center open fully to then cover the smaller fertile flowers. ‘RIE 02’ is distinguishable from the parent plants by flower color, and unique inflorescence development, which produces an average of 60 sterile flowers and 110 fertile flowers per inflorescence.

The inventor considers that ‘RIE 02’ is distinct from other varieties of Hydrangea known to the inventor in the following respects:

First, whereas other varieties of Hydrangea in commerce have four petals per floret on a flat, one-dimensional plane, ‘RIE 02’ has two to three layers of petals per floret, creating a double-flower appearance.

Second, whereas many novel varieties have been found in, or brought from, Japan in recent years, none appear to have the combination of uniqueness of flower form as above combined with greater vigor and faster growing to flowering stage which typifies ‘RIE 02’.

Third, the vigor of ‘RIE 02’ is evident in its strong thick stems which do not require staking to support the heavy blooms. ‘RIE 02’, although vigorous, exhibits a shorter internode distance than many other commercial forms of Hydrangea, allowing ‘RIE 02’ to be grown commercially with less or even no application of growth regulating chemical.

‘RIE 02’ was first asexually propagated by the inventor in the spring of 1995 in a cultivated area of Kyoto, Japan. The method used for asexual propagation was softwood cuttings. The characteristics of the new Hydrangea cultivar named ‘RIE 02’ have been determined stable and are reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

The following traits have been repeatedly observed and represent the characteristics of the new Hydrangea cultivar ‘RIE 02’. These traits in combination distinguish ‘RIE 02’ from all other commercial varieties of Hydrangea known to the inventor. ‘RIE 02’ has not been tested under all possible conditions and phenotypic differences may be observed with variations in environmental, climatic and cultural conditions, without however, any difference in gentoype.

-   -   1. Hydrangea ‘RIE 02’ is grown for use as both an indoor floral         potted plant and an outdoor ornamental flowering shrub.     -   2. Hydrangea ‘RIE 02’ exhibits flowers that are yellow-green and         pink in color.     -   3. Hydrangea ‘RIE 02’ exhibits unique inflorescence development         that produces an average of 60 sterile flowers and 110 smaller         fertile flowers per inflorescence.     -   4. Hydrangea ‘RIE 02’ exhibits a broad upright habit.     -   5. Hydrangea ‘RIE 02’ exhibits large dark-green leaves.     -   6. Hydrangea ‘RIE 02’ is 33 cm. in height and 42 cm. in diameter         in a 1.5-liter container.     -   7. Hydrangea ‘RIE 02’ is a shrub.     -   8. Hydrangea ‘RIE 02’ is deciduous.     -   9. Hydrangea ‘RIE 02’ performs best when planted in loam based         moisture retentive soil, in partial shade, with regular water.     -   10. Hydrangea ‘RIE 02’ is asexually propagated by the method of         softwood cuttings.     -   11. Hydrangea ‘RIE 02’ exhibits rigid, strong basal branches.     -   12. Hydrangea ‘RIE 02’ is hardy to USDA Zone 5.     -   13. Hydrangea ‘RIE 02’ blooms continuously from early April to         September.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying color drawings illustrate the overall appearance of the new Hydrangea cultivar ‘RIE 02’ showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ from the color values cited in the detailed botanical description, which accurately describe the actual colors of the new variety of Hydrangea named ‘RIE 02’.

The drawing labeled as FIG. 1 depicts an individual whole plant growing in a 1.5-liter container in a frost-protected greenhouse in De Kwakel, The Netherlands. Plants were grown in Peat moss soils with a PH of 6.0 to 6.4. The plant is approximately twenty-one months old. The plant was produced from a cutting which was rooted and grown in a four inch container, then transplanted into the 1.5 liter container and pinched to encourage basal branching, then allowed to shoot from the base and allowed to flower in its natural season. The plant was pruned back to the base after flowering. The drawing depicts the vigorous basal branching habit of ‘RIE 02’ in its second season of re-growth. Such a plant would be highly suitable for use as a stock plant for the purpose of providing cutting material for commercial propagation.

The drawing labeled FIG. 2 illustrates a portion of the inflorescence of ‘RIE 02’, with a close-up view of the sterile and fertile flowers.

All drawings were made using conventional techniques and although colors may appear different from actual colors due to light reflectance they are as accurate as possible, by conventional photography.

BOTANICAL DESCRIPTION OF THE PLANT

The following is the detailed description of ‘RIE 02’ as grown in a greenhouse in De Kwakel, The Netherlands. Data was collected in April 2004 from 12-month-old plants grown in 1.5-liter containers. The color determinations are in accordance with the 2002 Edition of the Colour Chart of The Royal Horticultural Society, London, England, except where general color terms of ordinary dictionary significance are used. The growing requirements are similar to the species.

-   Botanical classification: Hydrangea macrophylla ‘RIE 02’. -   Genus: Hydrangea. -   Species: macrophylla. -   Denomination: ‘RIE 02’. -   Commercial classification: Floral plant, ornamental shrub. -   Common name: Hydrangea. -   Use: Grown for use as a potted indoor plant or as an outdoor     ornamental flowering shrub. -   Container size: Suggested container size is 1.5-liter. -   Cultural requirements: Performs best when planted in loam based     moisture retentive soil, in partial shade, with regular water. -   Parentage: Hydrangea macrophylla ‘RIE 02’ is a hybrid plant that     resulted from the induced cross-pollination of the following parent     plants:     -   -   Female parent.—An unnamed individual Hydrangea macrophylla.         -   Male parent.—An individual Hydrangea macrophylla             ‘Sumidanohanabi’ (unpatented). -   Plant description:     -   -   Blooming seasons.—Spring and summer (natural season) or year             round if forced.         -   Plant habit.—Broad upright.         -   Plant type.—Deciduous shrub.         -   Overall plant shape.—Broad inverted triangle.         -   Vigor.—Moderate.         -   Growth rate.—An average of 15-cm. per month in spring.         -   Plant height.—33 cm. in height.         -   Plant diameter.—42 cm. in diameter.         -   Hardiness.—USDA Zone 5.         -   High temperature tolerance.—Tolerant to 32° Centigrade.         -   Root system.—Fibrous.         -   Propagation.—Propagation is accomplished by the method of             softwood cuttings.         -   Time and temperatures to develop roots.—Approximately 4             weeks is needed to develop roots on an initial cutting, at             temperatures of 18° to 20° Centigrade.         -   Crop time (outdoor plant crop).—An average of 12 months is             needed to produce a commercial container size flowering             outdoor plant, from a rooted cutting.         -   Temperatures (outdoor plant crop).—From rooted cuttings to             commercial size containers, the outdoor crop is grown at             natural outdoor temperatures utilizing unheated greenhouses             for winter protection.         -   Crop time (indoor plant crop).—An average of 4-6 months is             needed to produce a commercial container size flowering             indoor plant, from a rooted cutting.         -   Temperatures (indoor plant crop).—Transplant rooted cuttings             to liner pots and keep for a minimum of 6 weeks at below 5°             Centigrade to force dormancy. Transplant to 1.5-liter             containers and keep at 18° to 25° Centigrade for a minimum             or 10 weeks to produce commercial container size flowering             plants.         -   Disease and pest resistance or susceptibility.—No             susceptibility to pests or disease known to the inventor. -   Stem:     -   -   Number of lateral branches.—An average of 3 lateral             branches.         -   Lateral branch length.—Average is 22 cm. in length.         -   Lateral branch diameter.—Average is 5 mm. in diameter.         -   Stem shape.—Cylindrical.         -   Stem surface.—Slightly glossy.         -   Pubescence.—None observed.         -   Stem strength.—Strong.         -   Stem texture.—Rigid.         -   Stem color.—Individual colors 144A, 144B, N186C are present             on an individual stem.         -   Lenticels.—Present.         -   Quantity of lenticels.—An average of 9 per cubic cm. of stem             surface.         -   Lenticel color.—A combination of colors N186B and N186C is             present on an individual lenticel.         -   Lenticel height.—An average of 0.5 mm. in height.         -   Lenticel width.—An average of 2 mm. in width.         -   Branching habit.—Moderate to sparse basal branching.         -   Branching requirements.—Pinching encourages lateral             branching.         -   Internode length.—3.6 cm. between nodes. -   Foliage:     -   -   Type.—Deciduous.         -   Arrangement.—Opposite.         -   Division.—Simple.         -   Quantity of leaves per lateral stem.—An average of 10             individual leaves per lateral stem.         -   Leaf shape.—Broad oval.         -   Apex.—Short apiculate.         -   Base.—Ranges from obtuse to short attenuate.         -   Leaf margins.—Crenate.         -   Leaf length.—Average is 10.9 cm. in length.         -   Leaf width.—Average is 8.4 cm. in width.         -   Leaf appearance (adaxial and abaxial surfaces).—Semi-glossy             surfaces.         -   Leaf surfaces (adaxial and abaxial surfaces).—Glabrous.         -   Pubescence.—None present.         -   Venation pattern.—Pinnate.         -   Vein color (abaxial surfaces).—144B.         -   Vein color (adaxial surfaces).—146D.         -   Leaf color (adaxial surfaces).—A combination of colors 139A             and 137A is present on an individual leaf.         -   Leaf color (abaxial surfaces).—137D.         -   Attachment.—Petiolate.         -   Petiole length.—An average of 2.2 cm. in length.         -   Petiole diameter.—An average of 3 mm. in diameter.         -   Petiole surface.—Glabrous.         -   Petiole shape.—Cylindrical.         -   Petiole color.—144B.         -   Durability of foliage to stress.—High durability to stess.         -   Stipules, tendrils, thorns.—None observed.         -   Fragrance.—None observed. -   Flowers:     -   -   Flower arrangement.—Terminal inflorescence.         -   Inflorescence type.—Compound corymb.         -   Inflorescence height.—Average of 11.5 cm. in height.         -   Inflorescence diameter.—Average of 20 cm. in diameter.         -   Quantity of flowers per inflorescence.—An average of 110             fertile flowers and 60 sterile flowers per individual             inflorescence.         -   Flowering habit.—Blooms continuously from early April to             September.         -   Quantity of flowers per lateral stem.—An average of 110             fertile flowers, and 60 sterile flowers per individual             lateral stem.         -   Quantity of flower buds per lateral stem.—An average of 110             fertile flower buds and 60 sterile flower buds per             individual lateral stem.         -   Quantity of flowers and buds per plant.—An average of 330             fertile buds and flowers, and an average of 180 sterile buds             and flowers per individual plant.         -   Bud length.—Fertile flower buds are an average of 3 mm. in             length and sterile flower buds are an average of 6 mm. in             length.         -   Bud diameter.—Fertile flower buds are an average of 1.5 mm.             in diameter and sterile flower buds are an average of 3 mm.             in diameter.         -   Bud shape (fertile and sterile buds).—Obovate.         -   Bud apex (fertile and sterile buds).—Obtuse.         -   Bud color (fertile and sterile buds).—A combination of             colors 145A and 145C is present on an individual bud.         -   Flower aspect (fertile and sterile flowers).—Flowers range             from upward to outward facing on an individual plant.         -   Rate of opening (fertile and sterile flowers).—An average of             10% of the flowers on an individual plant open at once, and             all the flowers on an individual plant have opened by 6             weeks.         -   Flower diameter.—Fertile flowers are an average of 3.5 cm.             in diameter, and sterile flowers are an average of 6.3 cm.             in diameter.         -   Flower depth.—Fertile flowers are an average of 4 mm. in             depth and sterile flowers are an average of 2.1 cm. in             depth.         -   Flower shape (fertile and sterile flowers).—Rotate in shape.         -   Persistent or self-cleaning (fertile and sterile             flowers).—Persistent.         -   Peduncle shape.—Cylindrical.         -   Peduncle color.—Individual colors 144B and N186C are present             on an individual peduncle.         -   Peduncle length.—Average is 5.6 cm. in length.         -   Peduncle diameter.—Average is 3.5 mm. in diameter.         -   Peduncle surface.—Puberulent.         -   Peduncle angle.—Average angle is 40°.         -   Peduncle strength.—strong.         -   Pedicels (fertile and strerile flowers).—Present.         -   Lastingness of flowers.—An individual flower lasts 4 weeks.         -   Flower response time.—An average of 9 weeks.         -   Flower fragrance.—None observed. -   Fertile flowers:     -   -   Petal appearance.—Dull.         -   Petal surface.—Glabrous.         -   Petal number.—An average of 5 petals per flower.         -   Petals fused or unfused.—Unfused.         -   Petal shape.—Elliptic.         -   Petal margin.—Margin on an individual petal is a combination             of entire and dentate.         -   Petal apex.—From flower to flower an individual apex can             range from obtuse to acute.         -   Petal length.—Average is 2 mm. in length.         -   Petal width.—Average is 1 mm. in width.         -   Petal color (abaxial surfaces when opening).—143C.         -   Petal color (adaxial surfaces when opening).—143C.         -   Petal color (abaxial surfaces when fully opened).—143C.         -   Petal color (adaxial surfaces when fully opened).—143C.         -   Calyx.—Present.         -   Calyx shape.—Campanulate.         -   Calyx length.—Average of 3 mm. in length.         -   Calyx diameter.—Average of 3 mm. in diameter.         -   Sepals.—5 in number.         -   Fused or unfused.—Fused.         -   Sepal shape.—Ovate.         -   Sepal margin.—Entire.         -   Sepal apex.—Acute.         -   Sepal base.—Cuneate.         -   Sepal appearance.—Dull.         -   Sepal surfaces (adaxial and abaxial surfaces).—Glabrous.         -   Sepal length.—Average of 2 mm. in length.         -   Sepal width.—Average of 1 mm. in width.         -   Sepal color (abaxial and adaxial surfaces).—144C.         -   Pedicel length.—Average is 2 mm. in length.         -   Pedicel diameter.—Average is 1.5 mm. in diameter.         -   Pedicel angle.—Average angle is 35°.         -   Pedicel strength.—Moderate.         -   Pedicel strength.—A combination of colors 144A and 144B is             present on an individual pedicel.         -   Pedicel surface.—Puberulent.         -   Lenticels.—None observed on pedicels of fertile flowers. -   Sterile flowers:     -   -   Tepal appearance.—Dull.         -   Tepal surface.—Glabrous.         -   Tepal number.—An average of 16 tepals per sterile flower.         -   Tepals fused or unfused.—Unfused.         -   Tepal shape.—Rhomboidal.         -   Tepal margin.—Margin on individual tepal is a combination of             entire and Dentate.         -   Tepal apex.—Ranges from rounded to obtuse.         -   Tepal length.—Average of 2.6 cm. in length.         -   Tepal width.—Average of 1.9 cm. in width.         -   Tepal color (abaxial surfaces when opening).—Individual             colors 76C and 76D are present on an individual tepal.         -   Tepal color (adaxial surfaces when opening).—Individual             colors 75B, 77C and 77D are present on an individual tepal.         -   Tepal color (abaxial surfaces fully opened).—A combination             of colors 76C and 76D is present on an individual tepal.         -   Tepal color (adaxial surfaces when fully opened).—77C.         -   Tepal color fading to (adaxial and abaxial surfaces).—145C.         -   Calyx.—None observed.         -   Pedicel length.—Average is 3.4 cm. in length.         -   Pedicel diameter.—Average is 2 mm. in diameter.         -   Pedicel angle.—Average angle is 35°.         -   Pedicel strength.—Moderate.         -   Pedicel color.—Individual colors 76D and 145D are present on             an individual pedicel.         -   Pedicel surface.—Glabrous.         -   Pubescence.—None observed.         -   Lenticels.—None observed on sterile flowers. -   Reproductive organs:     -   -   Stamens.—None observed.         -   Anthers.—None observed.         -   Pistil.—An average of 3 pistils is present per individual             fertile flower.         -   Pistil length.—An average of 2 mm. in length.         -   Stigma.—Present.         -   Stigma shape.—Clavate.         -   Stigma color.—157D.         -   Style length.—An average of 1.7 mm. in length.         -   Style color.—157D.         -   Ovary.—Present on fertile flowers.         -   Ovary position.—Inferior.         -   Ovary color.—157D.         -   Ovary dimensions.—0.2 mm. in height and 0.2 mm. in diameter.         -   Ovary shape.—Globular. -   Seed production: No seed production has been observed to date. 

1. A new and distinct cultivar of Hydrangea plant named ‘RIE 02’ as described and illustrated herein. 